Over small ranges, the relationship is approximately linear, and linear control theory can be used.
In analog circuit design, the current-control view is sometimes used because it is approximately linear.
In the United States, the increase had been continuous and approximately linear from the earliest years of testing to about 1998.
While many real processes are not linear, they can often be considered to be approximately linear over a small operating range.
When the film is "wet" and "open", the weight loss will be approximately linear.
The enzyme produces product at an initial rate that is approximately linear for a short period after the start of the reaction.
Test score increases have been continuous and approximately linear from the earliest years of testing to the present.
This is approximately linear for temperatures above about 20 kelvins.
It looks approximately linear for all reasonable values of n, but this intuition is false.
Since the area of the flow passage increases as the float moves up the tube, the scale is approximately linear.